Study of Mechanism Producing Multi-Stage Heat Release in Supercharged HCCI Using Blended Fuel (Second Report)

- Influence of Fuel Type on Combustion by Spectroscopic Analysis and Chemical Kinetic Calculation -

Abstract

In this study, the effects of the fuel type on multi-stage heat release characteristics in a supercharged Homogeneous Charge Compression Ignition (HCCI) engine were investigated. These aspects were investigated by making spectroscopic measurements of in-cylinder gas, Fourier-transform infrared spectroscopy (FTIR) analysis of intermediate products and by conducting chemical kinetic analyses. Blended fuels of dimethyl ether (DME) and methane and DME and propane were used as the test fuel. The results showed that the blended fuel of DME and methane produced two-stage primary combustion, depending on the operating conditions, which had the effect of moderating combustion. With the blended fuel of DME and propane, main combustion was occurred in single-stage.